665063605 has 4 divisors (see below), whose sum is σ = 798076332. Its totient is φ = 532050880.

The previous prime is 665063587. The next prime is 665063611. The reversal of 665063605 is 506360566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122080401 + 542983204 = 11049^2 + 23302^2 .

It is not a de Polignac number, because 665063605 - 2⁹ = 665063093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66506356 + ... + 66506365.

It is an arithmetic number, because the mean of its divisors is an integer number (199519083).

Almost surely, 2^665063605 is an apocalyptic number.

It is an amenable number.

665063605 is a deficient number, since it is larger than the sum of its proper divisors (133012727).

665063605 is a wasteful number, since it uses less digits than its factorization.

665063605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133012726.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 665063605 is about 25788.8271350211. The cubic root of 665063605 is about 872.8797010742.

The spelling of 665063605 in words is "six hundred sixty-five million, sixty-three thousand, six hundred five".